TaskScheduler: Make Task::traits const.

base/task_scheduler/task.cc

Index: base/task_scheduler/task.cc
diff --git a/base/task_scheduler/task.cc b/base/task_scheduler/task.cc
index baac443b2d9f20023d2adc7af72e2b52137960c5..5a17b7f2093ee2668a4de8b6bc85f681e27823f7 100644
--- a/base/task_scheduler/task.cc
+++ b/base/task_scheduler/task.cc
@@ -9,20 +9,20 @@ namespace internal {
 
 Task::Task(const tracked_objects::Location& posted_from,
            const Closure& task,
-           const TaskTraits& traits_in,
+           const TaskTraits& traits,
            const TimeDelta& delay)
     : PendingTask(posted_from,
                   task,
                   delay.is_zero() ? TimeTicks() : TimeTicks::Now() + delay,
                   false),  // Not nestable.
-      traits(traits_in) {
-  // Prevent a delayed BLOCK_SHUTDOWN task from blocking shutdown before being
-  // scheduled by changing its shutdown behavior to SKIP_ON_SHUTDOWN.
-  if (!delay.is_zero() &&
-      traits.shutdown_behavior() == TaskShutdownBehavior::BLOCK_SHUTDOWN) {
-    traits.WithShutdownBehavior(TaskShutdownBehavior::SKIP_ON_SHUTDOWN);
-  }
-}
+      // Prevent a delayed BLOCK_SHUTDOWN task from blocking shutdown before
+      // being scheduled by changing its shutdown behavior to SKIP_ON_SHUTDOWN.
+      traits(!delay.is_zero() &&
+                     traits.shutdown_behavior() ==
+                         TaskShutdownBehavior::BLOCK_SHUTDOWN
+                 ? TaskTraits(traits).WithShutdownBehavior(
+                       TaskShutdownBehavior::SKIP_ON_SHUTDOWN)
+                 : traits) {}
 
 Task::~Task() = default;